Self-diagnosis system for an energy storage device

a self-diagnosis and energy storage technology, applied in emergency power supply arrangements, electrochemical generators, instruments, etc., can solve the problems of reducing the capacity of batteries, inaccurate voltage measurements, and none of the systems or methods described above provide an accurate evaluation of the state of health of batteries

Inactive Publication Date: 2006-02-09
BATHIUM CANADA
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  • Abstract
  • Description
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Problems solved by technology

The increase of the internal resistance is caused by the degradation of the battery's chemistry, which in turn reduces the battery's ability to hold a charge.
Unfortunately, these voltage measurements prove inaccurate when a battery discharge curve comprises a mild slope and are inadequate when a battery discharge curve comprises a plateau wherein the voltage of the battery is not sufficient to establish the remaining battery capacity.
Furthermore, none of the systems or methods described above provide an accurate evaluation of the state of health of a battery, in order to predict how long the battery may be able to perform before reaching a level of performance (battery capacity) at which replacement is required.

Method used

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[0027] Referring now to the drawings, and more particularly to FIG. 1, there is provided a partial illustration of an example of implementation of an energy storage module or battery 10 which utilizes a number of rechargeable solid-state thin-film electrochemical cells 12 for storing electrical energy. Such rechargeable thin-film electrochemical cells are particularly well-suited for use in the construction of high-current, high-voltage energy storage modules and batteries, such as those used to power electric vehicles or as back-up electricity supply for telecommunication networks for example.

[0028] As shown in FIG. 1, the energy storage module 10 includes a number of individual electrochemical cells 12 which are arranged in a stack configuration 14 and situated in a housing 16. It will be appreciated that a generic stack 14 of electrochemical cells 12 may be interconnected in various parallel and series relationships to achieve desired current and voltage ratings. To facilitate s...

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Abstract

A self-diagnosis system for an energy storage device, the latter including a plurality of electrochemical cells connected in series or parallel to form a cell string. The self-diagnosis system correlates a state of health of the battery based on the internal resistance value of each electrochemical cell of the energy storage device and determines a corresponding battery initial capacity which enables the self-diagnosis system to evaluate the exact capacity of the battery at any given time.

Description

FIELD OF THE INVENTION [0001] The present invention generally relates to the field of energy storage devices, such as rechargeable batteries. More specifically, the invention relates to a self-diagnosis system for a rechargeable battery capable to estimate the short term and long term capacity of the battery as well as its life expectancy. BACKGROUND OF THE INVENTION [0002] Rechargeable batteries are used in a wide variety of applications, for example as a propulsion power source for electric and hybrid vehicles or as a power reserve in telecommunications network stations. In any application, it is important to monitor the discharge capacity of the battery at any given time, as well as to monitor the state of health of the battery as it ages through degradation of its chemistry over repeated floating / charging / discharging cycles. This information helps to manage the timely replacement of a battery approaching the end of its useful life. [0003] A battery can be approximated as a volta...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H02J7/00G01R31/371G06F1/28G01R31/382G01R31/387G01R31/392H01M10/48H01M10/50H02J9/00H02J9/06H04M19/00
CPCG01R31/3655G01R31/3662G01R31/3679G01R31/3696H02J9/06H02J9/061H02J7/0047H01M10/48G01R31/392G01R31/389G01R31/364Y02E60/10H02J7/0048H02J7/005
Inventor VAILLANCOURT, JEAN-PIERRELAGUE, FREDERICRICHARD, MONIQUEGEOFFROY, SEBASTIENPARENT, MICHELCHOQUETTE, YVESPOTVIN, ESTELLE
Owner BATHIUM CANADA
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